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Periodic Classification Of Elements

Question
CBSEENSC10010560
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Balance the following skeleton equations:
(i)    KClO3 →KCl + O2
(ii)    Na2CO3 + HCl → NaCl + H2O + CO2
(iii)    CH4 + O2 → CO2 + H2O
(iv)    NaCl + H2SO4 → Na2SO4 + HCl
(v)    Fe + H2O → Fe3O4 + H2
(vi)    H2S + O2 → H2O + S
(vii)    H2 + N2 →NH3.

Solution

(i)   2KClO3 →2KCl + 3O2

(ii)
(a)    Na2CO3 + HCl →2NaCl + H2O + CO2
(b) Na2CO3 + 2HC1 →2NaCl + H2O + CO2

(iii)   
(a)    CH4 + O2 →CO2 + 2H2O
(b)    CH4 + 2O2 →CO2 + 2H2O

(iv)  
(a) 2NaCl + H2S04 →Na2S04 + HCl
(b) 2NaCl + H2SO4 →    Na2SO4 + 2HCl

(v)

(a)    3Fe + H2O →Fe3O4 + H2
(b)    3Fe + 4H2O →Fe3O4 + H2
(c)    3Fe + 4H2O → Fe3O4 + 4H2

(vi)
(a)    H2S + O2 → 2H2O + S
(b)    2H2S + O2 →2H2O + 2S

(vii)
(a)    N2 + H2→2NH3
(b)    N2 + 3H2 →2NH3

Some More Questions From Periodic Classification of Elements Chapter

What is a chemical equation? Illustrate with an example.

How will you know whether a chemical reaction has taken place?

How would you justify that a chemical reaction has taken place in the following cases:
(i)    Burning of magnesium ribbon in air.
(ii)    Addition of lead nitrate solution to potassium iodide solution.
(iii)    Addition of dilute hydrochloric acid to zinc granules.

How do you show that respiration is a chemical change?

Why is it necessary to obtain a balanced chemical equation?

Balance the following skeleton equations:
(i)    KClO3 →KCl + O2
(ii)    Na2CO3 + HCl → NaCl + H2O + CO2
(iii)    CH4 + O2 → CO2 + H2O
(iv)    NaCl + H2SO4 → Na2SO4 + HCl
(v)    Fe + H2O → Fe3O4 + H2
(vi)    H2S + O2 → H2O + S
(vii)    H2 + N2 →NH3.

Balance the following chemical equations:
(i)    NaOH + H2SO4 → Na2SO4 + H2O
(ii)    HNO3 + Ca(OH)2 → Ca(N03)2 + H2 O
(iii)    FeCl2 + H2S → HCl + FeS 

What does a balanced chemical equation convey to a chemist?

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